Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2021   10:13:49   (   0.38,-128.01) (   0.52,-128.56)   62.79                80
 09/18/2021   09:57:32   (   0.39,-127.99) (  -0.54,-123.98)  457.70                80
 09/19/2021   22:16:26   (  -0.37,-127.89) (  -0.68,-129.17)  146.27                80
 09/20/2021   22:00:09   (  -0.38,-127.86) (   0.38,-124.59)  374.15                80
 09/22/2021   10:18:56   (   0.36,-127.87) (   0.77,-129.76)  215.45                80
 09/23/2021   10:02:37   (   0.37,-127.84) (  -0.24,-125.17)  305.00                80
 09/24/2021   22:21:33   (  -0.35,-127.75) (  -0.93,-130.37)  299.17                80
 09/25/2021   22:05:14   (  -0.36,-127.71) (   0.08,-125.78)  220.70                80
 09/27/2021   10:24:01   (   0.33,-127.70) (   1.06,-130.95)  370.42                80
 09/28/2021   10:07:43   (   0.34,-127.67) (   0.05,-126.36)  149.21                80
 09/29/2021   22:26:38   (  -0.32,-127.57) (  -1.23,-131.56)  455.93                80